Selvage-heddle motion.



' No. 70|,528. Patented june 3, |902.

J. WILKINSON.

SELVAGE HEDDLE MOTIUN.

(Applxcaton filed. Ont. 5, 1901.)

(No Model.)

ATnNT rrICE. v

JABEZ WILKNSON, OF FALL RIVER, MASSACHUSETTS.

SELVAGE-HEDDLE MOTION.

sPEoIFIoArIoN forming part of Letters Patent No. 701,528, dated June 3, 1902.

Application iilod Ootobor 5, 1901. Serial No. 77,688. (No model.)

To @Z5 whom t nto/y concern:

Be it known that I, JABEZ WILKINSON, of Fall River, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Selvage-Motions7 of which the following is a specification.

Figure l is a vertical cross-section of my invention embodied in a loom, and Fig. 2 is a fragmentary perspective View showing the form and arrangement of means essential to said invention.

The principal object of my invention is to provide a mechanism for a loom with which either a plain selvage ora basket-selvage can be woven.

Heretofore to weave a plain selvage a plain selvage-motion was used. To'weave a basketselvage a different selvage-motion was necessary, each motion being substituted for the other as often as occasion required. This substitution called for the services of persons particularly skilled in adjusting said motions to each loom and necessitated the stoppage of each loom and the consequent idleness of itself and its operatives. Obviously where, as in a cotton-mill, looms are counted by hundreds this substitution has a very substantial effect on the productive capacity of each loom, and consequently of the mill.

Another feature of my invention lies in the location of a selvage-motion, the treadle and cams therefor being mounted; nearer rthe front of the loom than the rearthereof. By reason of such location the motion is accessible for any purpose-suchas cleaning, adjustment, and the likeand the front and rear selvage-heddles can be operated, respectively, by short and long heddle-treadles instead of long and short heddle-treadles, as was formerly the case. Any increased movement of the front selvage-heddles necessarily' resulting from the longer vertical movement of the rear selvage-heddles to form a shed or raceway of proper size for the shuttle is communicated to the short instead-of the long treadle, as formerly. Hence there is a saving in power and wear and tear of the operating parts and a uniformity of operation heretofore not obtainable.

In the drawings illustrating the principle of my invention and the best mode now known to me of applying the principle, A is a loomframe, B the selvage-motion, and C the driving mechanism. I

The selvage-motion B is mounted on two brackets h, one near each end of the loomframe A, and adjustably secured to the front flanged rail d by a jaw b' and aV-bolt b2, that engage the liange and are held in such engagement by a nut b3 on the threaded shank 6o of the bolt b2, projecting down through the jaw b' and the slotted base of the bracket b. Each bracket b has a treadle-stud b4, and on this stud are pivoted heddle-treadles b5 b, operated by their respective cams 127 bs, which 65 which are xed to a cam-shaft bf', having suitable bearings near the free ends of the lbrackets b. The free end portions. of the treadleb5 b have threaded holes therein to receive correspondingly-threaded arms 1910 b, 7o which extend outwardly therefrom in a horizontal direction and at right angles thereto. To these arms bw b are fastened the front and rear selvage-heddles Z312 bis, operatively connected by the heddle-strap bm, that passes over a plain roll bk", mounted in a stand bm, bolted to the arch of the loom and adjustable in and out in a manner similar to that shown and described in reference to the brackets b. The treadles, cams, bracket, and heddles 8c near each endofthe cam-shaft are identical in construction and operation, except those at one end are ninety degrees in advance of the other.

The driving mechanism C is made up of a sprocket-wheel c, splined to the cam-shaft b9, a chain c', anda double sprocket-wheel c2, fixed to thepick-cam shaft c3 in any wellknown manner; The double sprocket-wheel c2 is composed of two members c4 c5, prefer- -90 ably in one piece, the larger member c4being twice as large as the smaller member c5, but of the same size as the single sprocket-wheel c on the cam-shaft b9. A chain c is in operative engagement with the sprocket-wheel c and either of the members c4 c5 of the double sprocket-wheelc the chain c5 being longitudinally lengthened or shortened bythe addition or subtraction of a suitable number of its links. In the drawings the warp selvage-motion is shown ready to weave a basket-selvage.` The chain c being in engagement with the sprocket-wheel c on the cam-shaft and with IOO . position, as by a set-screw C6.

the smaller member c5 of the double sprocketwheel c2 on the pick-cam shaft e3, obviously the movement of the cams, treadles,land heddles operate once for every two revolutions of the pick-cam shaft--that`is, the selvageheddles will move once at every other pick and a basket-selvage is woven by the loom. Now should it be desirable to weave a plain selvage instead of a basket-selvage the chain c' is lengthened by the insertion of a number of links and caused to engage the larger member c4 of the double sprocket-wheel c2, the sprocket-wheel o being moved longitudinally along the splined cam-shaft b9 until it is in the same plane of the larger member c4 of the double sprocket-wheel. It is then locked in If motion is now imparted to the driving mechanism, the sprocket-wheels c c4 being of the same diameter, the heddles operate once for every revolution of the pick-cam shaft-that is, the selvage-heddles will move once at every pickand the loom weaves a plain selvage.

It will be noticed that by reason of the short and long treadles operating, respectively, the front and rear heddles neither of the arms Z310 and b in their upward and v downward movements rubs the heddles secured to the other arm. a valuable result.

It will be plainto those skilled in the art This, obviously, is

that my invention can be embodied in different forms without departing from the spirit thereof. For example, the cam-shaft can be driven by gearing that will give the desired speeds thereto; but I prefer the use of sprocket wheels and chain, because between the latter there is no jamming of lint, as there is between the teeth of gearing. I therefore wish to claim my invention in the broadest manner legally possible.

What I claim is- In a selvage-motion for looms, the combination of a pick-cam shaft; aGaIn-shaft; two adjacent sprocket-wheels, one having a diameter twice as great as that of the other, said Wheels being mounted on the pick-cam shaft; a sprocket-wheel having the same diameter as the larger sprocket-Wheel on the pickcam shaft; a chain to engage the sprocket-wheel on the cam-shaft, and either of the two different-sized sprocket-wheels on the pick-cam shaft; cams xed on said camshaft; selvage heddles selvage treadles connected with said selvage-heddles, and operated by said cams.

In testimony whereof I have afxed my signature in presence of two witnesses.

J ABEZ WILKINSON.

Witnesses:

CHARLES F. RICHARDSON. FLoRDnN HOWARD. 

